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DESCRIPTION
Demo circuit 1161B is a triple monolithic step-down
regulator with LDO featuring LT
is designed for 1.8V, 3.3V, 5.0V and 2.5V outputs from a
7V to 36V input. The current capability of each channel
is 2.4A, 1.3A, 1.4A and 0.2A respectively. Independent
input voltage, feedback, soft-start and power good pins
for each channel simplify complex power supply tracking/
sequencing requirements.
All three converters are either synchronized to a common
external clock input or single-resistor programmable from
250kHz to 2.5MHz using internal oscillator. At all frequen-
cies, a 180° phase shift between V
outputs is maintained, reducing input voltage ripple and
component size. Programmable frequency allows for opti-
mization between efficiency and external component size.
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT1
Output Voltage V
OUT2
Output Voltage V
OUT3
Output Voltage V
OUT4
Switching Frequency
Maximum Output Current I
Maximum Output Current I
Maximum Output Current I
Maximum Output Current I
Voltage Ripple V
OUT1
Voltage Ripple V
OUT2
Voltage Ripple V
OUT3
Voltage Ripple V
OUT4
Arrow.com.
Downloaded from
3507. The demo circuit
®
and the other two
OUT1
OUT1
OUT2
OUT3
OUT4
DEMO MANUAL DC1161B
Triple Monolithic Step-Down
Each output can be independently disabled using its own
soft-start pin, or by using the SHDN pin the entire part
can be placed in a low quiescent current shutdown mode.
The LT3507 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1161B.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
(T
= 25°C)
A
CONDITION
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 12V, I
= 2.4A
IN
OUT1
V
= 12V, I
= 1.3A
IN
OUT2
V
= 12V, I
= 1.4A
IN
OUT3
V
= 12V, I
= 0.2A
IN
OUT4
Regulator with LDO
VALUE
7V
36V
1.80V ±3%
3.33V ±3%
5.0V ±3%
2.52V ±3%
450kHz ±10%
2.4A
1.3A
1.4A
0.2A
<20mV
<20mV
<20mV
<10mV
LT3507
dc1161bf
1
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Table of Contents
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Related Manuals for Linear Technology LT3507
Summary of Contents for Linear Technology LT3507
- Page 1 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear 250kHz to 2.5MHz using internal oscillator. At all frequen- Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
Demo circuit 1161B is easy to set up to evaluate the 1. With power off, connect the input power supply to VIN performance of the LT3507. Refer to Figure 1 for proper and GND. measurement equipment setup and follow the procedure 2. -
Page 3: Sync Function
DEMO MANUAL DC1161B SYNC FUNCTION EMI FILTER Install a 10k R20 resistor if the board is synchronized from Install EMI filters on the backside of the DC1161, however, an external signal generator. a trace cut is required for the insertion of the option circuit. See Figure 3 for the cut line. -
Page 4: Parts List
DEMO MANUAL DC1161B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER / PART # Required Circuit Components CIN1, CIN2, CIN3 CAP ., X7R, 2.2μF , 50V, 10%, 1210 TDK, C3225X7R1H225K C1, C2, C9 CAP ., X7R, 0.22μF , 25V, 10%, 0603 TDK, C1608X7R1E224K C3, C10 CAP ., X5R, 47μF , 10V, 20%, 1206... -
Page 5: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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